I bought this set of rollers as a spare set for use when I clean my wooden floors rather than my tiled floors. I have been trying to buy a set of grey rollers since the beginning of March when I purchased my FC5 Cleaner but they have been out of stock for the past 3 months. I have now given up hope of ever getting a grey set, hence this purchase. The rollers themselves clean well and they wash well in the washing machine ready for the next time. I think they are a bit dear for what they are but hopefully I shouldn't have to buy too many sets.